Core lifter



Patented June 25, 1940 .CORE

LIFTER Frank Miller, East Orange., N. J., assignor to Ingersoll-Band Company, Jersey City, N. J., a corporation of New Jersey Application Deeember 1,1938, serial Ne. 243,361

6 Claims.

This invention relates to lifting devices, and more particularly to a core lifter adapted to lift a core from the ldrill hole. I

One object of the invention is to facilitate the operations of attaching the core lifter to and releasing it from the core.A

Other objects will be in part obvious and lin part pointed out hereinafter.

In the drawing accompanying this specificai tion and in which similar reference numerals refer to similar parts:

Figure 1 is an elevation, partly in section, of a core lifter constructed in accordance with the practice of the invention and showing the posii tion which the parts are required to vassume to I receive the core;

Figure 2 is a similar view showing the relative positions of the parts for gripping the core, and

' Figure 3 is a transverse view taken through D Figure 1 on the line 3-3.

Referring more particularly to the drawing, 20 designates, in general, vthe core-lifter and 2| a core defined by an annular kerf 22 in a bed of rock23.

The core lifter, constructed in accordance with the practice ofthe invention, comprises an outer casing 24 and asleeve 25 arranged within the casing 24.' Both the casing and the sleeve are -of cup-shape and the portion of the sleeve adjacent its open end has longitudinally extending slots 26 to form 4fiexible fingers 21 having serrations 28 on their inner vsurfaces for gripping the core 2 I.

The peripheral portions of the fingers 21 in the transverse plane of the serrations have inclined surfaces 29 which cooperate with a coniform surface 3l!A in the front end of the casing 2 4 to ex the fingers 21 inwardly and thereby cause the serrations 28 to be pressed into the ',0 surface of the core 2i.

Suitable means 'are provided for conveniently effecting relative longitudinal movement between the casing 24 to slide the coniform surface30 overl the inclined surfaces 29 for contracting the L5 sleeve. To this end the bottom or end wall 3l of the sleeve is provided, on its outer surface, with a bracket 32 which extends through an aperture 33 in the end wall 34 of the casing 24. The aperture- 33 and the portion of the bracket 32 lying J therein may be of rectangular or other suitable shape to prevent relative 'rotary movement be tween ,the casing and the sleeve and the bracket has a pair of arms 35 vthat are suitably spaced il with respect to each other to accommodate there- (Cl. 255'l2) betweenl a sheave 36 which is mounted upon a pin 31 seated in the arms 35. o

In the upper ends of the arms 35 .is a drawpin 38 which also extends through an end of a link 39 having an aperture 4l) in its opposite end to receive a hook 4I on a cable42 which may lead from suitable hoisting mechanism (not shown).

The link 39 also carries 'a sheave 43 mounted upon a pin 44 seated in the link, and on the l0 outer surface of the wall 34, diametrically oppof site-each other and in the same transverse plane as the sheave 36, are bearings 45 which may be secured to the wall 34 in any suitable manner. In the bearings 45 are shafts 46 vfor sheaves 41 which are positioned atA a lower elevation than the sheave 36, and trained over the upper sidesA of the sheaves 43 and 36 and around the undersides of the sheaves 41 is an endless exible member I9 for transmitting the power required 2n to eiect the relative movement necessary between the casing and thesleeve for contracting the sleeve.

Although the surfaces 30 and 29 are inclined in such degree as to enable the casing 24 to drop/5 by gravity afterthe core has been lifted to the surface and the lifting force has been released, it is found that this free descending movement ofthe casing is sometimes hampered by dirt present on the surfaces 36 and 29 and that the casing 24 must, therefore, be shifted forcibly with respect to the sleeve to bring these elements into positions in whichthe fingers 21 may again swing outwardly to release the core. The sleeve Cil 25 is accordingly provided with a series of 35 screws 48 secured to the wall 3| and extending through the wall 34., The screws 48 are of suitable length to make possible the necessary ad'- vjustments between the casing and the sleeve and carry nuts 49 which act against the vouter surface of the wall 34 for that purpose.

In practice, whenever it is intended to remove a core the core lifter is lowered into the kerf 22 until the wall 3l seats against the upper end of the core. The parts will be in position to receive 45 the core since, during the operation of lowering the core lifter, the draw-pin 36 will be in position to vconnect the link 39 with the arms 35 and 'the casing 24 will merely seat upon` the upper endof the sleeve 25. In this arrangement of the 50 parts the sleeve will be fully retracted in the casing and the nngers 21 will assume their normal positions so that 4the core 2l may readilyA enter 'the sleeve.

After the core lifter has been positioned coru rectly on the core the draw-pin 38 is removed to disconnect the link 39 from the arms 35 and lifting force is next applied to the link 39 through the cable 42, During the initial lifting movement` of the cable 42 the exible member I9 is drawn taut and tends to press the sleeve downwardly and will raise the casing 24 relatively to the sleeve. This movement of the casingl will draw the coniform surface 30 over the inclined surfaces 29 and cause the fingers 21 to be pressed inwardly and the serrations 28 to be pressed into the surface of the core.

The core lifter, together with the core, may then be raised to the surface of the ground and seated with its lowermost end upon a suitable object or support raised somewhat above the surface of the ground and capable of entering the casing 24. The cable 42 is then released to permit the casing 24 to slide downwardly along the sleeve for releasing the lingers ,21. In the event that the frictional engagement between the surfaces 30 and 29 may not be released in this manner the nuts 49 are threaded downwardly on the bolts 48 and in this Way the frictional engagement between the surfaces 30 and 29 may be broken.

After the casing has again assumed a position in which its end Wall 34 seats against the wall 3l of the sleeve the draw-pin 38 is inserted in the link 39 and the arms 35 and the core lifter will again be in readiness for insertion into the drill hole.

I claim: s

1T A core lifter, comprising a contractible sleeve, core gripping means on the sleeve, a casing encircling the sleeve, means on the casing for causing ,contraction of Vthe sleeve, and means connected to the casing and the sleeveand acting simultaneously against both for moving the casing longitudinally of the sleeve -for contractin the sleeve.

2. A core lifter, comprising a contractible sleeve, core gripping means on the sleeve, a casing encircling the sleeve, means on the casing for causing contraction of the skirt, and means connected to the casing and the sleeve and acting against both for moving the sleeve and the casing simultaneously in opposite directionsto contract the sleeve. v

Vpansion of the sleeve.

3. A. core lifter, comprising a contractible sleeve, core gripping means on the sleeve, a casing encircling the sleeve, means on the casing for causing contraction of the casing, means for preventing relative rotary movement between the casing and the sleeve, and means connected to the casing and the sleeve for simultaneously moving the casing and the sleeve longitudinally of each other in opposite directions for contracting the sleeve.

4. A core lifter comprising a contractible sleeve, core gripping means on the sleeve, a casing encircling the sleeve, means on the casing for causing contraction of the casing, means for preventing relative rotary movement between the casing and the sleeve, end walls on corresponding ends of the casing and the sleeve, and means connected to and acting against the end walls for simultaneously moving the casing and the sleeve Vlongitudinally of each other in opposite directions for contracting the sleeve.

5. A core lifter, comprising va, contractible sleeve, core gripping means on the sleeve, a casing encircling' the sleeve, means on thet casing for causing contraction of the sleeve. sheaves on corresponding ends of the sleeve and the casing, a flexible member trained over the sheaves for pulling the casing longitudinally of the sleeve in one direction to contract the sleeve, and means for eiecting longitudinal movement of the cas-l ing in the opposite direction with respect to the sleeve to permit expansion o! the sleeve.

6. A core lifter, comprising a contractible sleeve, core gripping means on the sleeve, a casing encircling the sleeve, means on the casing for causing contraction of the sleeve, a pair oi.' sheaves on the casing, a sheave on the sleeve Vdisposed between and above said sheaves, a flexible member trained over the top 'of the sheave on the sleeve and around the underside of the rst mentioned sheaves for pulling the casing longitudinally o! the sleeve in one direction to contract the sleeve, screws on the sleeve, and nuts on the screws acting against the casing for effecting longitudinal movement of the casing in the opposite direction with-respect to the sleeve to permit exmANxMnLEa. 

